Determine the Constant of Variation for the Stated Condition

Multiple Choice

Determine the constant of variation for the stated condition.
-The voltage across a resistor is jointly proportional to the resistance of the resistor and the current flowing through the resistor. If the voltage across a resistor is 32 volts for a resistor whose resistance is 4 ohms and when the current flowing through the resistor is 8 amperes, find the voltage across a resistor whose resistance is 2 ohms and when the current flowing through the resistor is 7 amperes.

A) 14 volts
B) 28 volts
C) 56 volts
D) 16 volts